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The .404 Jeffrey
June 8, 2024
Guns
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Calibre Description and Specifications
The .404 Jeffery is a large calibre rimless bottleneck cartridge that was originally designed with the dangerous game of Africa and India in mind. This cartridge has also been called the .404 Jeffery Rimless, .404 Rimless Nitro Express, and in Germany, as the 10.75× 73mm. The dimensions of the cartridge are shown in Figure 1. The maximum overall length of the cartridge is 3.350”.

Figure 1
The case uses a large rifle magnum primer and has a relative capacity of 113 grains of water (7.3 ml). When fired the cartridge generates a maximum pressure (C.I.P) of 52 938 pounds per square inch (364.99 MPa). The case rim thickness is 0.05” (1. 3 mm).

The .404 Jeffery is shown alongside a .505 Jeffery and .375 Holland and Holland in Figure 2 for comparison.

Figure 2
History
The cartridge was designed by the great British gunmaking company W.J. Jeffery & Co of England. They wanted to duplicate the performance of the .450/400 (3 ¼ “) cartridge.

Prior to 1912, W.J. Jeffery built .404 Rimless Nitro Express rifles on ex-military, standard length, 98 Mauser actions produced by Mauser Werke Obendorf that had the action and magazine box modified to fit (Figure 5).

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https://africanxmag.com/2024/06/08/the-404-jeffrey/

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John aka NitroX

...
Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
"A Sharp spear needs no polish"

Edited by NitroX (30/11/25 04:08 AM)

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